Earplug



FIG. 1 is a perspective view of an earplug showing my new design;

FIG. 2 is a side elevational view thereof, all other side views being mirror images thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

I claim, the ornamental design for an earplug, as shown and described. 